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The Weekly Tank Routine, and Why Small and Regular Beats Big and Rare
Fish do not mind slightly imperfect water. They mind water that changes quickly. That single fact is the argument for a short weekly routine over an occasional heavy one, and it is why the tanks we service that stay trouble-free are almost always the ones on a boring schedule.
The fifteen-minute weekly job
- Look before you touch. Count the fish. Watch how they are swimming and breathing. Check the heater light and the filter outflow. Thirty seconds of observation catches more problems than any test kit.
- Scrape the front glass. Do it before the water change so the debris goes out with the siphon.
- Siphon 20 to 30 per cent, vacuuming one section of substrate rather than the entire floor.
- Refill with conditioned water matched to temperature within a couple of degrees.
- Top up and tidy. Trim anything overgrown, remove dead leaves, wipe the outside glass.
That is the whole thing. Filter servicing is not on this list on purpose — it belongs on a two-to-four-week cycle, and doing it in the same session as a big water change is one disruption too many.
Why partial and regular wins
Nitrate accumulates continuously. A 25 per cent weekly change holds it at a low, steady level. A 60 per cent change once a month lets it climb for four weeks and then drops it sharply — and the drop is itself a shock, because pH, hardness and temperature all move at once.
Stable and slightly imperfect beats perfect once a month, every time.
Vacuum in sections
The substrate holds a meaningful share of your bacterial colony. Vacuuming the entire floor in one go disturbs all of it at once. Dividing the tank into quarters and doing one quarter a week gets the whole floor cleaned monthly while leaving three-quarters of the colony undisturbed at any moment.
In a planted tank, skip the planted areas entirely and vacuum only the open substrate.
Testing without becoming obsessive
Once a tank is established and stable, weekly testing is more than most people need. A sensible rhythm:
- Daily during cycling, and for a fortnight after adding fish or changing filtration.
- Weekly for the first two months of a new tank.
- Monthly once it is established, plus any time something looks wrong.
Nitrate is the one to watch on an established tank; it tells you whether your water change schedule is keeping up. Ammonia and nitrite should be flat zero, and any reading at all is worth acting on the same day.
Feeding is a maintenance job
More tank problems trace back to feeding than to any other single cause. Uneaten food decomposes into ammonia, drives bacterial blooms and feeds algae.
Feed what the fish clear in two minutes, once or twice a day, and skip a day a week. Adult fish are entirely comfortable with that and it gives the filter a chance to catch up. If food is reaching the substrate, you are feeding too much.
The monthly extras
- Rinse the filter’s mechanical media in old tank water — never under the tap.
- Renew activated carbon if you run it.
- Check the heater against a separate thermometer; failed heaters usually fail on.
- Pull artificial planting and scrub off algae film in old tank water.
Nets, scrapers, siphons and the rest live under nets and maintenance, and conditioners under water care.
Going away
Healthy adult fish handle a week without food better than they handle a well-meaning neighbour with a full tub. If someone is coming in, pre-portion each day’s food into a pill organiser and leave written instructions that say, in bold, not to add extra.
Before you go, do a water change, clean the filter’s mechanical media the week before rather than the day before, and check the heater. Automatic feeders are fine for longer absences; test one for a week while you are home.
What the fish are telling you
The thirty seconds of observation at the start of the routine is worth more than any single test, because behaviour changes before chemistry does. Fish hanging at the surface and gulping usually means low dissolved oxygen — often a hot day, a clogged filter, or a surface film blocking gas exchange. Fish clamped against the substrate with fins held tight is a general stress signal worth investigating the same day. Flicking against decor points to irritation, either parasites or a chemistry swing.
Equally important is what normal looks like on your tank, which is why the same person doing the same routine each week beats a rota. You notice the change because you saw last week.
Seasonal adjustments
Tanks are not the same job in January and July. In summer, warm rooms push tank temperature up, dissolved oxygen down, and metabolism — and therefore waste production — up with it. That is the season to increase surface agitation, feed a little less, and watch the heater is not fighting the room.
In winter, the risk moves to draughts and heater failure. A tank near an exterior door can swing several degrees when the door opens repeatedly, and a heater that has been quietly running all summer is most likely to fail in the month you need it most. A spare heater in a cupboard costs little and saves a bad weekend.
Make it boring
The tanks that stay healthy are the ones on the same day every week, whether or not they look like they need it. Fifteen minutes on a Sunday morning, done consistently, prevents almost everything that would otherwise turn into a two-hour rescue.
Everything mentioned here is on our shop page, common questions are on the FAQ, and if a tank is misbehaving, tell us what you are seeing.
From our shelves
Products in this store that relate to what is covered above:
Prices are in US dollars. Delivery timings are on our shipping policy page and the return and refund policy sets out the window if something is not right.
